| 摘要 |
PURPOSE:To improve productivity and performance, by so constituting that a metal heating element having high fusing point is inserted in a tube made of a dense sintered ceramic body and having a closed bottom end, in which ceramic powder is filled for securing, in a titled glow plug for a diesel engine. CONSTITUTION:A heating element 4 made of a metal having a high fusing point, such as a tungsten wire is inserted vertically in the center part of a tube 3 made of a dense sintered ceramic body and having a closed bottom end. Then, ceramic powder 5, such as magnesium oxide or silicon nitride is filled in a gap of the tube 3, which is sintered and a heating element 4 is secured firmly in the tube 3. Then, a perforated porcelain tube 6 is fitted to an opening of the tube 3, lead wires 4a and 4b of the heating element 4 are pulled out and the wires 4a and 4b are soldered to a metal sleeve 2 and a pipe 7 respectively. The sleeve 2 is secured to main metal fittings 1. With this constitution, productivity and performance can be improved. |
